1. Atmospheric Sciences and Global Change Division Pacific Northwest National Laboratory Richland Washington USA
2. Atmospheric Sciences Program and Physics Department Michigan Technological University Houghton Michigan USA
3. Now at Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland Washington USA
4. Earth and Environmental Sciences Division Los Alamos National Laboratory Los Alamos New Mexico USA
5. Now at Cooperative Institute for Research in Environmental Sciences University of Colorado Boulder Boulder Colorado USA
6. Environmental Molecular Sciences Laboratory Pacific Northwest National Laboratory Richland Washington USA
7. Chemical Physics and Analysis Pacific Northwest National Laboratory Richland Washington USA